csc_check csr_check csx_check_sym z_csc_check z_csr_check z_csx_check_sym

csc_check() void csc_check ( int  m, int  n, const double  val[], const int  ptr[], const int  ind[], int  result[], int *  info  ) Check sparse matrix (CSC) Purpose This routine checks the sparse matrix in CSC format. Use separate routine csx_check_sym to check symmetry. Parameters [in] m Number of rows of the matrix. (m >= 0) (if m = 0, returns without computation) [in] n Number of columns of the matrix. (n >= 0) (if n = 0, returns without computation) [in] val[] Array val[lval] (lval >= nnz) (nnz is the number of nonzero elements of input matrix) Values of nonzero elements of input matrix. [in] ptr[] Array ptr[lptr] (lptr >= m + 1) Column pointers of input matrix. [in] ind[] Array ind[lind] (lind >= nnz) (nnz is the number of nonzero elements of input matrix) Row indices of input matrix. [out] result[] Array result[lresult] (lresult >= 10) Check result (valid for 0 <= info <= 15). result[0]: Indexing of ptr[] and ind[] (0 or 1). (base = ptr[0]) result[1]: Number of nonzero elements. (nnz = ptr[m] - ptr[0]) result[2]: Number of nonzero elements in lower triangular part. (nnz_lower) result[3]: Number of nonzero elements in upper triangular part. (nnz_upper) result[4]: Number of nonzero diagonal elements. (nnz_diag) result[5]: Number of elements with zero values (val[i] = 0). (n_zero) result[6]: Number of diagonal elements with zero values (val[i] = 0). (n_zero_diag) result[7]: Number of empty columns. (empty_cols) result[8]: Number of columns with unsorted row indices. (unsorted_cols) result[9]: Number of invaid row indices. (invalid_inds) [out] info = 0: Successful exit. = i < 0: The (-i)-th argument is invalid. = 1: Empty column(s) found.(*) = 2: Column(s) with unsorted row indices found.(*) = 4: Diagonal elements with zero values (val = 0) found.(*) = 8: Invalid row index(es) found.(*) (*) Sum of these codes will be returned (e.g. 15 = 1 + 2 + 4 + 8 indicates that all four cases were detected). = 16: The value of ptr[0] is invalid. = 17: The value of (ptr[m] - ptr[0]) is invalid. = 18: the value(s) of ptr[i](i > 0) are invalid.